From 105c39e693e48f6bfe6a0ef8f1a608f4652b59d5 Mon Sep 17 00:00:00 2001
From: helpfulchicken <64881516+helpfulchicken@users.noreply.github.com>
Date: Fri, 6 Nov 2020 10:57:21 +1300
Subject: [PATCH] Fix for minimal-printf when printing sign of double between
 0.0 and -1.0

---
 platform/source/minimal-printf/mbed_printf_implementation.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/platform/source/minimal-printf/mbed_printf_implementation.c b/platform/source/minimal-printf/mbed_printf_implementation.c
index 455ec55890d..e473b201b62 100644
--- a/platform/source/minimal-printf/mbed_printf_implementation.c
+++ b/platform/source/minimal-printf/mbed_printf_implementation.c
@@ -264,6 +264,12 @@ static void mbed_minimal_formatted_string_double(char *buffer, size_t length, in
     /* get integer part */
     MBED_SIGNED_STORAGE integer = value;
 
+    /* write sign if integer part is zero and value is negative */
+    if ((value < 0.0) && (integer == 0)) {
+        /* write sign */
+        mbed_minimal_putchar(buffer, length, result, '-', stream);
+    }
+
     /* write integer part */
     mbed_minimal_formatted_string_signed(buffer, length, result, integer, stream);